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The values of COEF for the two specifications are shown in Tables 1 and 2, respectively. In both specifications, incentive/disincentive rates are determined based on the opportunities for leveling and road classes. An opportunity for leveling consists of each instance of the following: milling of existing surface, placement of a lift of AC and placement of a frictioncourse. In the 1992 specification, three categories were classified with different incentive or disincentive rate. In the 1996's revised specification eight categories were classified.

Because of a lack of hard data, many highway agencies are hesitant to move forward unless the benefits to themselves and the public can be demonstrated. To answer these challenges and ultimately develop an effective and reliable pavement smoothness specification, it is critically important to analyze statistically the historical smoothness data from the states that have applied such a specification for many years. The Arizona Department of Transportation (ADOT) has been using smoothness based incentive/disincentive specifications since 1990.

Advances in pavement design, asphalt mix testing and design, and construction equipment may help in achieving this goal. However, no real improvement will be achieved without improving the current Quality Control/Quality Assurance (QC/QA) practices. Smoothness testing is one of the QC/QA tests that requires improvements. 048m) Rolling Straightedge (RSE). , 415 Lawrence Bell Drive, Suite 3, Amherst, NY 14221. 2NJDOT Research Project Manager, PO Box 600, Trenton, NJ 08625-0600. org 44 CONSTRUCTINGSMOOTH HOT MIX ASPHALT Surface tolerances measured with the RSE are then used to evaluate the initial pavement smoothness and the construction quality.